package com.hmdp.service.impl;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.bean.copier.CopyOptions;
import cn.hutool.core.lang.UUID;
import cn.hutool.core.util.RandomUtil;
import com.baomidou.mybatisplus.core.toolkit.BeanUtils;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hmdp.dto.LoginFormDTO;
import com.hmdp.dto.Result;
import com.hmdp.dto.UserDTO;
import com.hmdp.entity.User;
import com.hmdp.mapper.UserMapper;
import com.hmdp.service.IUserService;
import com.hmdp.utils.RegexUtils;
import com.hmdp.utils.UserHolder;
import lombok.extern.slf4j.Slf4j;
import org.springframework.data.redis.connection.BitFieldSubCommands;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;
import javax.servlet.RequestDispatcher;
import javax.servlet.http.HttpSession;
import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Random;
import java.util.concurrent.TimeUnit;

import static com.hmdp.utils.RedisConstants.*;
import static com.hmdp.utils.SystemConstants.USER_NICK_NAME_PREFIX;

/**
 * <p>
 * 服务实现类
 * </p>
 *
 * @author 虎哥
 * @since 2021-12-22
 */
@Slf4j
@Service
public class UserServiceImpl extends ServiceImpl<UserMapper, User> implements IUserService {

    //TODO 注入StingRedis
    @Resource
    private StringRedisTemplate stringRedisTemplate;

    /**
     * 发送验证码
     * @param phone
     * @param session
     * @return
     */
    @Override
    public Result sendCode(String phone, HttpSession session) {
        //1.校验手机号
        if (RegexUtils.isPhoneInvalid(phone)){
            //2.如果不符合，返回错误信息
            return Result.fail("手机号格式错误");
        }
        //3.符合，生成验证码
        String code = RandomUtil.randomNumbers(6);

        //4.保存验证码到session
        //session.setAttribute("code",code);
        //4.TODO 保存验证码到 redis
        stringRedisTemplate.opsForValue().set(LOGIN_CODE_KEY + phone,code,LOGIN_CODE_TTL,TimeUnit.MINUTES);

        //5.发送验证码
        log.info("发送短信验证码成功，验证码：{}",code);
        //返回ok
        return Result.ok();
    }

    /**
     * 验证码登录、注册
     * @param loginForm
     * @param session
     * @return
     */
    @Override
    public Result login(LoginFormDTO loginForm, HttpSession session) {
        //1.校验手机号
        String phone = loginForm.getPhone();
        if (RegexUtils.isPhoneInvalid(phone)){
            //2.如果不符合，返回错误信息
            return Result.fail("手机号格式错误！");
        }
        //2.校验验证码
        //Object cacheCode = session.getAttribute("code");        //取出session中的code值
        //TODO 根据手机号取出redis中的验证码并校验
        String cacheCode = stringRedisTemplate.opsForValue().get(LOGIN_CODE_KEY + phone);
        String code = loginForm.getCode();                          //取出前端的code值
        if ( cacheCode == null || !cacheCode.equals(code)){
            //3.不一致，报错
            return Result.fail("验证码错误！");
        }

        //4.一致，根据手机号查询用户  select * from tb_user where phone = ?
        User user = query().eq("phone", phone).one();

        //5.判断用户是否存在
        if (user == null){
            //6.不存在，创建新用户并保存
             user = creatUserWithPhone(phone);
        }
        //7.保存用户信息到session中
        //session.setAttribute("user",user);
        //存放UserDTO对象
        //session.setAttribute("user", BeanUtil.copyProperties(user, UserDTO.class));

        //7.TODO 保存用户信息到 redis 中
        //7.1 TODO 随机生成token，作为登录令牌
        String token = UUID.randomUUID().toString(true);
        //7.2 TODO 将User对象转为HashMap存储
        UserDTO userDTO = BeanUtil.copyProperties(user, UserDTO.class);
        Map<String,Object> userMap = BeanUtil.beanToMap(userDTO,new HashMap<>(),
                CopyOptions.create().setIgnoreNullValue(true)
                        .setFieldValueEditor((fieldName,fieldValue) -> fieldValue.toString()));
        //7.3 TODO 存储
        String tokenKey = LOGIN_USER_KEY + token;
        stringRedisTemplate.opsForHash().putAll(tokenKey,userMap);
        //7.4 TODO 设置token有效期
        stringRedisTemplate.expire(tokenKey,LOGIN_USER_TTL,TimeUnit.MINUTES);
        //8. TODO 返回token到浏览器客户端
        return Result.ok(token);
    }

    /**
     * 签到功能实现
     * @return
     */
    @Override
    public Result sign() {
        //1. 获取当前登录用户
        Long userId = UserHolder.getUser().getId();
        //2. 获取日期
        LocalDateTime now = LocalDateTime.now();
        //3. 拼接key
        String keySuffix = now.format(DateTimeFormatter.ofPattern("yyyyMM"));
        String key = USER_SIGN_KEY + userId + keySuffix;
        //4. 获取今天是本月的第几天
        int dayOfMonth = now.getDayOfMonth();
        //5. 写入Redis SETBIT key offset 1
        stringRedisTemplate.opsForValue().setBit(key,dayOfMonth - 1, true);
        return Result.ok();
    }

    /**
     * 统计连续签到
     * @return
     */
    @Override
    public Result signCount() {
        //1. 获取当前登录用户
        Long userId = UserHolder.getUser().getId();
        //2. 获取日期
        LocalDateTime now = LocalDateTime.now();
        //3. 拼接key
        String keySuffix = now.format(DateTimeFormatter.ofPattern("yyyyMM"));
        String key = USER_SIGN_KEY + userId + keySuffix;
        //4. 获取今天是本月的第几天
        int dayOfMonth = now.getDayOfMonth();

        //5. 获取本月截止今天为止所有的签到记录  BITFILED sign:5:202410 GET u17 0
        List<Long> result = stringRedisTemplate.opsForValue().bitField(
                key,
                BitFieldSubCommands.create()
                        .get(BitFieldSubCommands.BitFieldType.unsigned(dayOfMonth)).valueAt(0)
        );
        if (result == null || result.isEmpty()){
            //没有任何签到结果
            return Result.ok(0);
        }
        Long num = result.get(0);
        if (num == null || num == 0){
            return Result.ok(0);
        }
        //6. 循环遍历
        int count = 0;
        while (true){
            //6.1 让这个数字与1做与运算，得到数字的最后一个bit位     判断这个bit位是否为0
            if ((num & 1) ==0) {
                //6.3如果为0，说明未签到，结束
                break;
            }else{
                //6.4如果不为0，说明已签到，计数器+1
                count++;
            }
            //把数字右移一位，抛弃最后一个bit位，继续下一个bit位
            //num >>>= 1;
            num = num >>> 1;
        }
        return Result.ok(count);
    }

    private User creatUserWithPhone(String phone) {
        //1.创建用户
        User user = new User();
        user.setPhone(phone);
        user.setNickName(USER_NICK_NAME_PREFIX + RandomUtil.randomString(10));    //使用系统常量
        //2.保存用户
        save(user);
        return user;
    }
}
